.show{
  display:block;
}
.hide{
  display:none;
}
.default{
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1031;
  color: #fff;
}